EP0510215A1 - Procede pour reguler l'epaisseur d'un revetement de chaussee dans une niveleuse a moteur et procede pour selectionner les conditions permettant une commande automatique - Google Patents

Procede pour reguler l'epaisseur d'un revetement de chaussee dans une niveleuse a moteur et procede pour selectionner les conditions permettant une commande automatique Download PDF

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Publication number
EP0510215A1
EP0510215A1 EP91919801A EP91919801A EP0510215A1 EP 0510215 A1 EP0510215 A1 EP 0510215A1 EP 91919801 A EP91919801 A EP 91919801A EP 91919801 A EP91919801 A EP 91919801A EP 0510215 A1 EP0510215 A1 EP 0510215A1
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EP
European Patent Office
Prior art keywords
thickness
screed
pavement
height
sensors
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91919801A
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German (de)
English (en)
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EP0510215B1 (fr
EP0510215A4 (en
Inventor
Makio Takasaki Plant Fujita
Fumio Takasaki Plant Goto
Tetsuo Takasaki Plant Ogawa
Akio Takasaki Plant Ishii
Tomohiro Gocho
Narimasa Yamabe
Ichiro Miyazaki
Masaaki Niigata Engineering Co. Ltd. Saito
Yoshihiro Niigata Constr. Machinery Co.Ltd. Sasa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niigata Engineering Co Ltd
Nikko Corp Ltd
Original Assignee
Niigata Engineering Co Ltd
Nippon Hodo Co Ltd
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Priority claimed from JP2307588A external-priority patent/JPH0749645B2/ja
Priority claimed from JP30758290A external-priority patent/JPH0749641B2/ja
Application filed by Niigata Engineering Co Ltd, Nippon Hodo Co Ltd filed Critical Niigata Engineering Co Ltd
Publication of EP0510215A1 publication Critical patent/EP0510215A1/fr
Publication of EP0510215A4 publication Critical patent/EP0510215A4/en
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Publication of EP0510215B1 publication Critical patent/EP0510215B1/fr
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/004—Devices for guiding or controlling the machines along a predetermined path
    • E01C19/006—Devices for guiding or controlling the machines along a predetermined path by laser or ultrasound
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/07—Apparatus combining measurement of the surface configuration of paving with application of material in proportion to the measured irregularities

Definitions

  • This invention relates to a method for controlling the thickness of pavement and setting the automatic control conditions used for leveling machines such as the asphalt finisher and the base paver.
  • a paved road In general, a paved road must be finished to a level surface.
  • One current method for finishing the paved surface of the road and making it level requires using curbstones or the gutter on the edge of the road as the reference plane (or line) according to which the paved surface can be finished.
  • Another method for finishing the paved surface of the road requires a use of an averaging beam (about as long as the tractor unit) which is placed along the side of a tractor unit in the travelling direction and by considering the unpaved surface of the road as a approximately flat.
  • the operator To operate such conventional leveling machines, the operator must have knowledge of the pavement conditions including the type of mixed asphalt material to be used, the pavement width, and the pavement thickness. Moreover, the operator must run the machine while watching the actual surface to be paved.
  • curbstones are not always found on the edge of the road to be paved. Moreover, when curbstones are available for the reference plane, the flatness of the ground may be gradually degraded as the distance from the curbstones increases.
  • the latter method requires an averaging beam, involving the use of large equipment. With larger paving equipment, operations are difficult on narrower roads.
  • the averaging beam can be used only after the base preparation has been completed to some degree to diminish unevenness. In spite, the averaging beam method cannot control the thickness of the pavement.
  • the conventional leveling machine depends on the operator's sense for operation. The operator's skill often affects the quality of leveling; it is, therefore, difficult to always achieve an excellent finish with the conventional leveling machine.
  • This new automatic leveling machine is designed to be automatically operated in accordance with the operating conditions such as the type of mixed aspalt material, pavement width, and pavement thickness. This information is entered into the control unit from the keyboard.
  • An object of the invention is to provide a method for setting the conditions of automatic control of the leveling machine, to control the pavement thickness without using large equipment such as an averaging beam.
  • the first invention has the following configuration.
  • a pair of height sensors which are attached to that leveling machine in the travelling direction with the specified spacing between them so as to tilt together with the screed measure the height of the unpaved surface when the leveling machine runs the same distance as the spacing between the height sensors, and the measured value is used to calculate the pavement thickness of the paved surface.
  • the screed is controlled to offset that uneven level, feeding back the difference between the thickness of pavement calculated above and the preset target thickness of the pavement.
  • This configuration ensures the flatness of the paved surface without requiring the use of any special device such as an averaging beam as described in the section on the conventional technology because the uneven level of the road surface is detected by height sensors located in front of the screed which is then controlled to offset any detected unevenness.
  • the thickness of the paved portion of the pavement is calculated and controlled on the basis of the output signal from a pair of height sensors, and of the difference between the calculated thickness of the pavement and the target thickness of the pavement, the thickness of the pavement will be close to the desired thickness.
  • the height of the paved surface of the road is measured at intervals of a specified distance in the travelling direction, and the measured values are used to create the datum line of the pavement thickness.
  • the height of the unpaved surface is also measured, and this measured value is used to obtain the target level and the pavement thickness at the target point at the specified distance from the screed. Then, the target level compared with the datum line of the pavement thickness at the target point, and the screed is controlled to eliminate any difference.
  • the datum line to the pavement thickness achieved by measuring the paved surface indicates that paving the road with the screed tilted at the present angle will result in a finished surface at a very similar level as the datum line of the pavement thickness.
  • the target thickness of the pavement at the target point represents the target value of the ideal thickness of the pavement.
  • Controlling the operation of the screed by comparing the calculated value and the target value to eliminate any difference between the two values at the target point at the specified point means that the road is being paved while controlling the screed so as to enable to achieve the desired thickness at the specified point.
  • controlling the screed in order to achieve the desired thickness of the pavement at the target point as described above is a method best-suited in cases where there is an actual need to provide pavement with a thickness close to the ideal value.
  • the method for controlling the screed mentioned above does not require any conventional averaging beam or other large-scale equipment.
  • the third invention has the following configuration.
  • the leveling machine which levels mixed asphalt under the operating conditions preset in the control unit, has a hopper which contains mixed asphalt material, a feeder which sends mixed asphalt material from the hopper to the screw, a screw which receives mixed asphalt material from the feeder and spreads it left and right, and a screed which levels the mixed asphalt material which has been spread by the screw mounted on the travelling tractor unit.
  • the operating conditions are prerecorded on a medium such as the IC card in the control unit.
  • the thickness of the pavement and other operating conditions are entered into a recording medium by a specialist in the office. Therefore, conditions can be written in quickly and accurately, with no errors.
  • the operator of the leveling machine simply insert the recording medium into the control unit, then starts the control unit to initiate the leveling work.
  • the data on the recording medium is rewritten to include the new conditions. If the operating conditions remain unchanged, the recording medium is repeatedly used. This allows a streamlined procedure for setting the operating conditions for the control unit.
  • Figure 1 is a side view of the asphalt finisher embodied in the present invention.
  • Figure 2 is a block diagram, providing an example of the arithmetic unit.
  • Figure 3 is an explanatory drawing of the first and second embodiments.
  • Figures 4 (A) and (B) are explanatory drawings for determining the thickness of pavement over the base course.
  • Figure 5 is a block diagram of a second embodiment of the arithmetic unit.
  • Figures 6 (A), (B), and (C) are explanatory drawings for determining the difference between the level of the base course and the thickness of the pavement.
  • Figure 7 is an explanatory drawing of the second embodiment.
  • Figure 8 is a side view of an example of the leveling machine in the third embodiment.
  • Figure 9 is a block diagram, providing an example of the control unit.
  • Figure 10 is an explanatory drawing for illustrating the principle of the pavement thickness measurement by the leveling machine shown in Figure 8.
  • Figure 11 is an explanatory drawing of the reference line for the thickness of the pavement.
  • Figure 12 is the front view of an example of the display screen on the display unit.
  • Figures 1 to 4 show an embodiment of the present invention applied to an asphalt finisher.
  • the numeral (1) in Figure 1 shows the tractor unit for the asphalt finisher AF.
  • a hopper (2) is provided to carry the mixed asphalt material.
  • Mixed asphalt material in the hopper (2) is sent to the rear (to the right of Figure 1) by a feeder at the bottom of the tractor unit body, then is spread by a screw uniformly to the left and right, and leveled by a pair of screeds (5) on the left and right sides of the tractor unit.
  • the screed (5) is supported by a supporting pin (7), which is provided at approximately the center of the side sections of the tractor unit (1) via a leveling arm (6).
  • the supporting pin (7) is moved up and down by a pivot cylinder (8).
  • the basic structure of the asphalt finisher AF is well known.
  • the symbol (11) shows the measuring units, one is provided on the left, and one on the right side of the tractor unit.
  • the measuring unit (11) consists of a first height sensor (13) at the end of the measuring arm (12), a second height sensor (14) at the center of the measuring arm (12), which acts as a mate sensor to the first sensor (13), and a tilt sensor (15) to measure the tilting angle of the measuring arm (12).
  • the base end of the measuring arm (12) (the center of Figure 1) is pin-supported by a frame (5a) which supports the screed (5). With this pin-support, the measuring arm (12) tilts while duplicating the movement of the screed (5).
  • first sensors (13) and the second sensors (14) are possible.
  • the present example uses sensors which utilize ultrasonic waves.
  • the distance between the sensors (13) and (14) is set to 1/2 (or any other whole number fractions) of the distance between the second sensor (14) and the rear edge of the screed (5).
  • the relative height of the sensors (13) and (14) to the screed (5) is set at a value which remains constant, regardless of the tilt angles for both the screed (5) and measuring arm 12.
  • the symbol (17) shows a distance sensor for the travel distance calculation.
  • the symbol (18) shows an L-shaped arm attached so that it can move up/down together with the screed (5).
  • the base end (to the right of Figure 1) of the arm (18) is fixed to the frame (5a) supporting the screed (5), and the front end of the arm (18) is provided with a third height sensor (19) to measure the distance to the road surface.
  • the third height sensor (19) is located between the second height sensor (14) and the rear edge of the screed (5). Consequently, the same distance M is provided between the rear edge of the screed (5) and the third height sensor (19), between the third height sensor (19) and the second height sensor (14), and between the second height sensor (14) and the first height sensor (13).
  • the third height sensor (19) uses an ultrasonic wave sensor in the same manner as the first sensor (13) and the second height sensor (14).
  • the arithmetic unit (30) is connected to the first height sensor (13), the second height sensor (14), the tilt sensor (15), and the distance sensor (17).
  • the arithmetic unit (40) is connected to the third height sensor (19) (see Figure 2).
  • the arithmetic unit (30) consists of an A/D (Analog to Digital) converter (31) which receives an analog output from the height sensors (13) and (14) and the tilt sensor (15), and converts this analog output to a digital output, an I/O (Input/Output) interface (32) which receives an individual output from the A/D converter (31), and a distance sensor (17), an operation unit (33), which performs operations based on data from the I/O interface (32), and a data storage unit (34) which receives and stores values obtained by the operation unit (33) and outputs those values from the storage part (34) to the operation units (33).
  • A/D Analog to Digital
  • the arithmetic unit (40) consists of an A/D converter (41), which receives an analog output from the third height sensor (19) and converts it to a digital output, an I/O interface (42), which receives a digital output from the A/D converter (41), an operation unit (43), which is electrically connected to the operation unit (33) and which performs operations based on data from the I/O interface (42), and an I/O interface (44) which provides data processing for values obtained from the operation unit (43).
  • a signal output from the I/O interface (44) is sent to a solenoid valve (46) inserted in the hydraulic circuit (which is not illustrated) to operate that solenoid valve (46), so that the pivot cylinder (8) will either extend or retract.
  • the arithmetic unit (30) performs the specified operation based on the measurement signal sent from the height sensors (13) and (14) when the tractor unit (1) travels over a distance equal to the spacing between the height sensors (13) and (14).
  • the arithmetic unit (40) always performs the specified computing whenever the tractor unit (1) is travelling.
  • the details of the operation conducted by the operation unit (33) are 1 to calculate the thickness of pavement T from the difference between the levels at two measurement points simultaneously measured by a pair of height sensors (13) and (14), 2 to choose multiple continuous points from the calculated thickness of pavement T and calculate the average value Ta of the thickness of pavement T, and 3 to calculate the difference ⁇ between the calculated average value Ta of the thickness of pavement T and the target thickness of pavement To.
  • the details of the operation conducted by the operation unit (43) are 1 to calculate the target control value Lo measured by the third height sensor (19) based on data obtained when the operation of the asphalt finisher AF is steady, and calculate the amount of action required in the pivot cylinder (8) for controlling the screed based on the calculated target value Lo, 2 to calculate the difference E between the value measured by the third height sensor (19) and the object control value Lo, and 3 to provide an appropriate correction for the target control value Lo measured by the third height sensor (19) when the difference ⁇ between the object thickness of pavement To and the actual average thickness of pavement Ta exceeds a certain range.
  • the screed (5) is controlled in order to correct the differnce between these two values. This control is based on the data previously stored in memory of the operation part in accordance with the different types of-experiments.
  • the thickness of pavement T can be calculated by using the following equation.
  • T H21 + ⁇ - Mtan ⁇ 2 - H0 (2) where the symbols in the equation above have the following meaning:
  • the equations (1) and (2) above are provided for an easier understanding of the method used to calculate the level difference ⁇ and the thickness of pavement T.
  • the method differs slightly from those used by the measuring unit (11) of by the asphalt finisher AF in Figures 1 and 3.
  • the thickness of pavement T is calculated after the tractor unit (1) travels over the distance equal to the spacing M between the height sensors (13) and (14), rather than the distance 2M between the screed (5) and the second height sensor (14).
  • the asphalt finisher AF begins by sending a mixed asphalt material in the hopper (2) to the screw through the feeder, while the tractor unit (1) travels at a constant speed as in the conventional system. This material is then uniformly spread in front of the screed (5) which levels the material.
  • the distance covered by the tractor unit (1) is measured by the distance sensor (17), and, when the travel distance reaches M, the first height sensor (13) and the second height sensor (14) measure the distance to the base course surface. This measurement result is then forwarded to the arithemtic unit (30).
  • the arithmetic unit (30) calculates the thickness of pavement T on the basis of the output signals from the height sensors (13) and (14), the distance censor (17), and the tilt sensor (15), as described above. On the basis of this calculated pavement thickness, the arithmetic unit (30) also derives the average value Ta of the pavement thickness at multiple continuous measurement points on the paved surface, determining the difference ⁇ between the average value and the preset target thickness of pavement. The determined value is then forwarded to the arithmetic unit (40). Data is sent to the arithmetic unit (40) when the tractor unit travels over a specified distance (for example, 5 m) or at specified time intervals.
  • a specified distance for example, 5 m
  • the distance to the base course surface at the distance M in front of the screed (5) is constantly measured by the third height sensor (19), and this measured value is relayed to the arithmetic unit (40).
  • the arithmetic unit (40) determines the difference between the value L measured by the third height sensor (19) which has been sent to the arithmetic unit (40) and the predetermined target control value Lo, and, based on that difference, the arithmetic unit (40) determines how to control the pivot cylinder.
  • the target control value Lo can be obtained when the operator specifically presses the specified switch during the initial operation of the asphalt finisher after the operator judges that the operation is steady.
  • the control signal for the pivot cylinder described above is sent to the solenoid valve (46) via the I/O interface (44) to extend or retract the pivot cylinder (8), which controls the screed accordingly (5).
  • the tractor unit When the tractor unit has travelled over the specified distance (for example, 5 m), it is determined, based on the signal sent from the operation unit (33), whether or not the average value Ta of the actual thickness of the pavement is greatly different from the target thickness of the pavement To. If this difference is outside a certain range, the constant Lo is adjusted to an appropriate value.
  • the specified distance for example, 5 m
  • This technology ensures flatness for the asphalt finisher, which is an embodiment of the present invention.
  • the pavement thickness can be corrected to a value close to the target thickness of the pavement.
  • FIG. 5 shows another arithemtic unit.
  • This arithmetic unit (30) consists of an A/D converter (31) which receives an analog output from the height sensors (13) and (14) and the tilt sensor (15), and converts this output to a digital output, an I/O interface (32) which individually receives the digital signals from the A/D converter (31) and the distance sensor (17), a (33) which performs operations based on data from the I/O interface (32), a data storage unit (34) which receives and stores values obtained in the operation unit (33) and outputs such values to the operation unit (33), and an I/O interface (35) which provides data processing for values calculated by the operation unit (33).
  • a signal output from the I/O interface (35) is then sent to the solenoid valve (36) which adjusts the pivot cylinder (8) by either extending or retracting it.
  • the arithmetic unit (30) performs the specified operations on the basis of the measurement signals received from the height sensors (13) and (14).
  • the signals are measured when the tractor unit (1) travels over a distance equal to the space between the height sensors (13) and (14).
  • the command signal for the amount of operation L of the pivot cylinder (8) calculated above is sent to the solenoid valve (36) integrated into the hydraulic circuit, which is not illustrated. As the solenoid valve (36) is operated, the pivot cylinder (8) either extends or retracts.
  • the thickness of pavement at the target point at distance M (xN integers) ahead of the screed (5) is calculated from the level difference ⁇ 4 and ⁇ 5 and the ideal thickness of the pavement To, and the required amount of the movement of the pivot cylinder to change the position of the screed (5) to eliminate the discrepancy between the datum line and the target point, is determined.
  • This calculated value is sent to the solenoid valve (36) via the I/O interface (35) to extend or retract the pivot cylinder (8).
  • the operation described above is repeated whenever the tractor unit (1) travels over the distance M.
  • the screed (5) is controlled so as to obtain the ideal thickness of the pavement at the point M distance ahead.
  • FIGs 8 to 12 show another embodiment of the asphalt finisher of the present invention.
  • the numeral (1) represents the tractor unit of an asphalt finisher AF.
  • This tractor unit (1) is a crawler type, and is provided with a hopper (2) which contains a mixed asphalt material As, a feeder (3) which sends the mixed asphalt material from the hopper (2) to the rear (to the right of Figure 1), a screw (4) which uniformly spreads the mixed asphalt material As sent from the feeder (3) to the left and right, and a screed (5) levels the mixed asphalt material As which has been spread by the screw (4).
  • the screed is suspended on the leveling arms (6) and (6) (only the leveling arm on the left side is shown in Figure 8) via the frame (5a).
  • a leveling arm (6) is mounted on each side of the tractor unit (1), so that it can swivel up and down around the supporting pin (7).
  • the base end of the rod of a pair of the left and right screed cylinders (9) is attached to the top of the rear end of the tractor unit (1) so that it can freely rotate, and the lower end of the rod is attached to the read end of each leveling arm (6) so that it can freely rotate.
  • screed (5) can be moved up and down around the supporting pin (7).
  • the basic structure of the asphalt finisher AF is also well known.
  • the symbol (11) represents the measuring unit.
  • the measuring unit (11) consists of a basic member (29) which can freely rotate within a perpendicular plane in the travelling direction while the rear end is pivoted with a supporting pin (28) to a supporting member (10) fixed to the top of a frame (5a), a hydraulic cylinder (51) which is pivoted to a mounting member (50) fixed to a leveling arm (6) and also pivoted to a mounting member (52) whose piston rod is fixed to the basic member, a slope sensor (53) installed on the top of the basic member (29) which detects the slope of that basic member (29) and sends a control signal to the control valve (not illustrated) of the hydraulic cylinder (51), and a first height sensor (the height above the road detector) (21) and second height sensor (22) which are pivoted to mounting members (20) and (20a), respectively, and fixed to the basic member (29).
  • the mounting member (20) is fixed to the front end of the basic member (29), and the other mounting member (20a) is provided at a point 1/3 from the mounting member (20) of the distance between the mounting member (20) and the supporting pin (28).
  • the supporting pin (28) is positioned midway of screed (5).
  • the slope sensor (53) which measures the angle of the slope controls the basic member (29) so that the angle of slope remains zero (that is, the basic member remains horizontal).
  • Each of the height sensors (21) and (22) consists of a cylindrical member (23), a bar member (24), and a potentiometer (not illustrated).
  • the cylindrical member (23) and the bar member (24) fit each other, and can freely extend or retract.
  • the potentiometer converts the relative displacement of the cylindrical member (23) and the bar member (24) into an electrical signal.
  • the lower ends of the bar members (24) and (24) of the height sensors (21) and (22) are pivoted with a coupling member (25).
  • the coupling member (25) is provided with wheels (26) on the bottom at each pivoting position of the bar members (24) and (24), and coupled to the tractor unit (1) with a coupling bar (not illustrated).
  • the coupling member (25) is dragged by the tractor unit (1) to travel on the base course surface, and transmits information on the uneven levels of the base course surface to the height sensors (21) and (22).
  • This tractor unit (1) is also provided with an odometer (27) ( Figure 9).
  • the height sensors (21) and (22) and the odometer (27) are connected to a control unit (arithmetic unit) (30).
  • This control unit (30) consists of an A/D converter (31) which receives an analog output from the height sensors (21) and (22) and converts this analog output into a digital output, an I/O interface (32) which receives a digital output from the A/D converter (31) and the odometer (27), an operation unit (33) which performs operations based on data received from the I/O interface (32), a data storage unit (34) which receives and stores values obtained by the operation unit (33) and outputs data to the operation unit, an I/O interface (35) which provides data processing to send these values to a display unit (54) installed at the operator's seat of the tractor unit (1) or at any appropriate place, and an input part which inputs the initial operating conditions of the pavement.
  • the control unit (30) performs the specified operations based on the measurement signals received from the height sensors (21) and (22).
  • the signals are measured when the tractor unit (1) travels over a distance (l) which is 1/3 of the length (3l) between the mounting member (20) and the supporting pin (28) attached to the basic member (29). If the base course surface has a slope at an angle ⁇ , it is recommended that the covered distance for the calculation of the tractor unit (1) be taken to be 1sec ⁇ .
  • the primary operation of the control unit (30) is to calculate the difference between the levels at two measurement points, P1 and P2, P2 and P3, etc., simultaneously measured by a pair of height sensors (21) and (22) in order to calculate the thickness of pavement t at the position of the supporting pin (28) which is the reference point (P1 in Figure 10), and to determine the datum line of the pavement from one of the lines T1, T2, and T3 which connect the point P1' by "t" above the measurement point P1 at the reference point position and the points P2', P3', and P4' by "t*" (the target thickness of the pavement) above the measurement points P2, P3, and P4 in front of (to the left in Figures 10 and 11) of the measurement point P1, or one line derived through the arithmetic processing by, for example the averaging of such multiple lines.
  • the results of the measurement before the (n-1) measurement that is, the (n-1)th measurements by the first and second height sensors (21) and (22) are N n-1 and M n-1 , respectively, and the results of the (n-2)th measurements by the first and second height sensors (21) and (22) are N n-1 and M n-1 , respectively.
  • the level difference can be calculated by the following equations (3), (4), and (5): nth measurement (n) measurement: M n - N n (3) (n-1)th measurement: M n-1 - N n-1 (4) (n-2)th measurement: M n-2 - N n-2 (5)
  • the thickness of pavement t can be calculated by the equation (6).
  • t M n + (M n-2 - N n-2 ) + (M n-1 - N n-1 ) -L (6)
  • the value (M n-2 - N n-2 ) is the level difference at P1 and P2, that is, ⁇ 1.
  • the value (M n-1 - N n-1 ) is the level difference at P2 and P3, that is, ⁇ 2.
  • the value L is the height from the bottom of the screed (5) to the basic member (29). This value remains constant.
  • the control unit (30) determines the datum line to be the line T1 which connects the point P1' by "t” above the point P1 to the point P2' by "t*" above the point P2.
  • the control unit (30) determines the datum line of the thickness of pavement to be the highest one T2 of the lines T2, T2, and T3, which connect the point P1' by "t” above the reference measurement point P1 to the points P2', P3', and P4' by "t*" above the measurement points P2, P3, and P4, respectively.
  • leveling machines There are several types of leveling machines; a machine which uses wheels instead of crawlers, a machine with ultrasonic or laser height sensors (21), (22), etc. The detailed structures of such machines depend on individual application.
  • the target thickness of the pavement t* is input into the IC card as an initial pavement condition, which is then entered into the control unit (30) by inserting the IC card into the input part (37).
  • the target thickness of the pavement t* includes the left target thickness of the pavement and the right target thickness of the pavement. This thickness may be set to any value, for example 50 mm or 70 mm.
  • the following initial pavement conditions are also entered into the IC card.
  • the setting items and the contents are as follows: N Selecting a method to control the thickness of the pavement Priority control of the thickness of pavement Priority control of the flatness Control of the side level Control of the cross slope Others N Selecting the type of mixed material Coarse-graded asphalt concrete (20) Dense-graded asphalt concrete (20) Dense-graded asphalt concrete (13) Fine-graded asphalt concrete (13) Dense-graded gap asphalt concrete (13) Others N Determining the width of the pavement The width of the pavement can be set corresponding to the width of the road, for example 4.5 m, 4.0 m, or 3.5 m. N Setting the planned length of the pavement The length of pavement can be set to, for example, 500 m or 300 m. N Setting the density of the mixed material The density can be set to, for example, 2.40 t/m3. N Setting the planned working speed The speed can be set to, for example, 3.0 m/min.
  • the initial paving conditions are usually written onto the IC card at the office.
  • the IC card containing these initial conditions is delivered to the operator, who then inserts the IC card into the input slot (37) of the operation board.
  • the settings of the IC card are displayed on the Initial Conditions Setting screen (38) ( Figure 12) of the display unit (54). The operator can, therefore, confirm the initial conditions from the display on the Initial Conditions Setting screen (38) before starting the paving work.
  • the operator When the paving work is finished, the operator removes the IC card from the input slot (37) and returns it to the office.
  • the operator should type the required initial paving conditions into the control unit (30) from the keyboard (not illustrated) near the input slot (37) or at the control panel (54) to make any required modifications.
  • the IC card stores the date and time, name of the mixed asphalt material, changes in the thickness of the pavement, width of the pavement, covered distance, amount of mixed material used, and any other required operation data. After the pavement work has been finished, the IC card is removed from the machine, and is used to manage the pavement construction.
  • the thickness datum line is displayed on the other screens of the display unit (36).
  • the present invention ensures the flatness of the paved surface, without using any special devices such as the averaging beam described in the section summarizing the "conventional technology", and controls the tilting angle of the screed, feeding back any difference between the actual thickness of the pavement calculated from data from a pair of the height sensors and the target thickness of pavement, the present invention is very effective in ensuring that the thickness of the pavement will be very close to the desired value.
  • the present invention enables the thickness of the pavement and other operating conditions to be set quickly and accurately.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mining & Mineral Resources (AREA)
  • Road Paving Machines (AREA)
  • Container Filling Or Packaging Operations (AREA)

Abstract

Dans cette invention, un bras mesureur (12) est fixé au chassis (5a) de la niveleuse de façon à soutenir une règle à araser le béton (5); des détecteurs de hauteur (13 et 14) sont montés sur le bras mesureur (12) et un autre détecteur de hauteur (19) est monté sur un bras (18) de la règle à araser le béton (5). Les espacements entre l'extrémité de queue de la règle à araser le béton (5) et le détecteur de hauteur (19), entre le détecteur de hauteur (19) et le détecteur de hauteur (14) et entre le détecteur de hauteur (14) et le détecteur de hauteur (13), sont sélectionnés constants. Un détecteur de distance qui calcule la distance d'avance est prévu sur le véhicule. La hauteur Ho des deux détecteurs de hauteur (13 et 14) par rapport à la règle à araser le béton (5) est maintenue constante à une valeur donnée, quelle que soit l'inclinaison de la règle à araser le béton (5) et du bras mesureur (12). Les détecteurs (13, 14 et 17) sont connectés à une unité arithmétique (30) et le détecteur de hauteur (19) est connecté à une unité arithmétique (40), respectivement. L'unité arithmétique (30) calcule l'épaisseur du revêtement de la chaussée en réponse aux signaux de sortie provenant des détecteurs de hauteur (13 et 14), et l'unité arithmétique (40) détecte les inégalités d'une surface sans revêtement en réponse aux signaux de sortie provenant du détecteur de hauteur (19) et elle commande la règle (5) en vue de corriger ces inégalités. Les conditions de travail sont sélectionnées dans le dispositif de commande (30) au moyen d'un support d'enregistrement de données, tel qu'une carte à circuits intégrés.
EP91919801A 1990-11-14 1991-11-14 Dispositif pour régler l'épaisseur d'un revêtement de chaussée Expired - Lifetime EP0510215B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2307588A JPH0749645B2 (ja) 1990-11-14 1990-11-14 敷均し機械における舗装厚制御方法
JP307588/90 1990-11-14
JP307582/90 1990-11-14
JP30758290A JPH0749641B2 (ja) 1990-11-14 1990-11-14 敷均し機械における舗装厚制御方法
PCT/JP1991/001560 WO1992008847A1 (fr) 1990-11-14 1991-11-14 Procede pour reguler l'epaisseur d'un revetement de chaussee dans une niveleuse a moteur et procede pour selectionner les conditions permettant une commande automatique

Publications (3)

Publication Number Publication Date
EP0510215A1 true EP0510215A1 (fr) 1992-10-28
EP0510215A4 EP0510215A4 (en) 1993-05-05
EP0510215B1 EP0510215B1 (fr) 1997-05-07

Family

ID=26565172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91919801A Expired - Lifetime EP0510215B1 (fr) 1990-11-14 1991-11-14 Dispositif pour régler l'épaisseur d'un revêtement de chaussée

Country Status (5)

Country Link
US (1) US5393167A (fr)
EP (1) EP0510215B1 (fr)
KR (1) KR100206726B1 (fr)
DE (1) DE69126017T2 (fr)
WO (1) WO1992008847A1 (fr)

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EP2535456A1 (fr) * 2011-06-15 2012-12-19 Joseph Vögele AG Finisseuse de route dotée d'un dispositif de mesure de l'épaisseur de couche
CN102828459A (zh) * 2011-06-15 2012-12-19 约瑟夫福格勒公司 具有层厚测量设备的路面摊铺机
US8395542B2 (en) 2010-08-27 2013-03-12 Trimble Navigation Limited Systems and methods for computing vertical position
US9033611B2 (en) 2011-06-15 2015-05-19 Joseph Vogele Ag Road paver with layer thickness measuring device

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
NL1009364C2 (nl) * 1998-06-10 1999-12-13 Road Ware B V Inrichting voor het bepalen van een profiel van een wegdek.
WO1999064681A1 (fr) * 1998-06-10 1999-12-16 Road Ware B.V. Dispositif permettant de determiner le contour d'une surface de route
US8395542B2 (en) 2010-08-27 2013-03-12 Trimble Navigation Limited Systems and methods for computing vertical position
EP2535456A1 (fr) * 2011-06-15 2012-12-19 Joseph Vögele AG Finisseuse de route dotée d'un dispositif de mesure de l'épaisseur de couche
CN102828459A (zh) * 2011-06-15 2012-12-19 约瑟夫福格勒公司 具有层厚测量设备的路面摊铺机
EP2535457A1 (fr) * 2011-06-15 2012-12-19 Joseph Vögele AG Finisseuse de route dotée d'un dispositif de mesure de l'épaisseur de couche
US8696237B2 (en) 2011-06-15 2014-04-15 Joseph Vogele Ag Road paver with layer thickness measuring device
US8702344B2 (en) 2011-06-15 2014-04-22 Joseph Vogele Ag Road paver with layer thickness measuring device
US9033611B2 (en) 2011-06-15 2015-05-19 Joseph Vogele Ag Road paver with layer thickness measuring device
CN102828459B (zh) * 2011-06-15 2015-08-26 约瑟夫福格勒公司 具有层厚测量设备的路面摊铺机

Also Published As

Publication number Publication date
DE69126017T2 (de) 1997-11-06
EP0510215B1 (fr) 1997-05-07
KR920702454A (ko) 1992-09-04
US5393167A (en) 1995-02-28
DE69126017D1 (de) 1997-06-12
WO1992008847A1 (fr) 1992-05-29
EP0510215A4 (en) 1993-05-05
KR100206726B1 (ko) 1999-07-01

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